Even though Aston's allegiance to the Winters was apparent, his overt determination to locate and rescue them from the outside exposed him to scrutiny from the enemies of the Winters. This heightened attention meant that every move Aston made would be closely monitored by the Coltons and their allies. It's highly likely that any information Aston possessed would swiftly become common knowledge among the Coltons, thanks to the spotlight on his actions and the traitor who's feeding these pieces of information to the Coltons.
To deceive the Coltons effectively, Aston's collaboration was crucial. There's a saying that goes, "To fool your enemies, you must first fool your allies." By employing this strategy, they could mislead even a potential mole in their midst, maintaining control over the narrative and concealing the truth from prying eyes.